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US 11,885,880 B2Granted
Unwrapped phases for time-of-flight modulation light
AssigneeMicrosoft Technology Licensing, LLC
InventorZhanping Xu
Life of this patent
Estimating the term…
Abstract
Adaptive phase unwrapping for a time-of-flight camera. A scene is illuminated with modulation light having two or more frequencies that do not have a common integer denominator. The modulation light that is reflected off objects within the scene is received at a sensor array. The received modulation light is then processed and weighted in the complex domain to determine unwrapped phases for each of the two or more frequencies of modulation light.
Claims18
A method for a time-of-flight camera, comprising:
- illuminating a scene with modulation light having two or more frequencies that do not have a common integer denominator;
- at a sensor array, receiving the modulation light reflected off objects within the scene;
- and
- determining unwrapped phases for each of the two or more frequencies of modulation light by at least:
- processing the received modulation light to determine wrapped phase vectors for each frequency of modulation light;
- converting the wrapped phase vectors to phase scalars in a complex domain;
- and
- determining unwrapped phases in the complex domain based on the phase scalars.
5 more elements
A time-of-flight camera, comprising:
- a modulated light emitter configured to illuminate a scene with modulation light having two or more frequencies that do not have a common integer denominator;
- a sensor array configured to receive the modulation light reflected off objects within the scene;
- a controller configured to:
- process the received modulation light to determine wrapped phase vectors for each frequency of modulation light;
- and
- determine unwrapped phases for each of the two or more frequencies of modulation light by at least
- converting the wrapped phase vectors to phase scalars in a complex domain;
- and
- determining unwrapped phases in the complex domain based on the phase scalars.
6 more elements
A method for a time-of-flight camera, comprising:
- illuminating a scene with three or more frequencies of modulation light;
- at a sensor array, receiving the modulation light reflected off objects within the scene;
- processing the received modulation light to determine wrapped phase vectors for each frequency of modulation light;
- converting the phase vectors to phase scalars in a complex domain;
- and
- determining unwrapped phase in the complex domain based on the phase scalars.
3 more elements
Dependencies are inferred from the claim text.